Calender apparatus

Abstract

To provide a calender apparatus having excellent productivity and safety.SOLUTION: A calender apparatus with a plurality of rolls arranged in its vertical direction and capable of forming a nip part between the rolls neighboring to each other includes a frame for holding the plurality of rolls in a rotatable manner; the plurality of rolls include a shaft portion projecting from around a rotation axis at both ends of each roll; the calender apparatus includes a bearing part for holding the shaft portion in the frame and a roll hanging jig contacting with the bearing part; and the roll hanging jig is connected with hanging means capable of positioning the roll hanging jig in the vertical direction.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to a calendering device for adjusting the surface smoothness, thickness and bulk density of a paper sheet produced by a papermaking machine or a coating machine. [Background technology]

[0002] In the paper manufacturing process, a calendaring device is generally used to adjust the surface smoothness, gloss, thickness, etc., of the paper. In papermaking machines, a calendaring device is often installed after the dryer part or the size press part. In coating machines, a calendaring device is installed between the dryer part and the winder device. Alternatively, there are calendaring devices that are independent of the papermaking machine or coating machine and rewind and process the wound paper.

[0003] In paper manufacturing, in order to adjust the smoothness and gloss to meet customer needs, several grades of paper are produced from the same raw materials and paper-making / coating processes under the same manufacturing conditions by changing the calendaring conditions. Patent Document 1 describes a method for producing paper with smoothness and glossiness that meets customer needs by arranging two calendar devices in parallel and changing the paper passage path to change the calendar conditions by using two calendars separately. However, in the method described in Patent Document 1, it is necessary to change the paper passing path of the calendar every time the grade is changed. The paper passing work is labor-intensive and dangerous, which is a safety issue. In addition, the production line must be stopped during the paper passing work, which reduces productivity. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Special Publication No. 7-122233 Summary of the Invention [Problem to be solved by the invention]

[0005] The present invention aims to provide paper products with various gloss levels and smoothness desired by customers while ensuring operator safety and increasing productivity by making it possible to change calendar processing conditions without changing the paper feed path. [Means for solving the problem]

[0006] The present invention has the following aspects. [1] A calendaring device in which a number of rolls are arranged vertically and a nip can be formed between adjacent rolls, the calendaring device having a frame that rotatably holds the number of rolls, the number of rolls having axles protruding from near the rotation axis at both ends of each roll, the calendaring device having bearings for holding the axles in the frame and a roll lifting jig in contact with the bearings, the roll lifting jig being connected to a lifting means whose position can be adjusted vertically. [2] The bearing portion has a bearing mechanism and a housing portion that houses the bearing mechanism, the housing portion has a cover portion that is narrower in diameter and extends toward the end of the shaft portion than the bearing mechanism, and the roll lifting jig is in contact with both the housing portion and the cover portion. A calendar device as described in [1]. [3] A calendar device as described in [1] or [2], wherein the roll lifting jig extends horizontally and in a direction perpendicular to the rotation axis of the roll, and adjusts the position of the roll lifting jig by applying force to the end of the roll lifting jig in the extension direction. Effect of the Invention

[0007] The present invention is a calendering device that allows the calendering conditions to be changed without changing the paper feed path, and according to the present invention, it is possible to provide paper products with various gloss levels and smoothness levels desired by customers while ensuring the safety of operators and increasing productivity. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] The calendar device of the present invention will be described below with reference to the drawings. As shown in Fig. 1, multiple rolls are stacked vertically in the frame 1 of the calendering device. Seven calender rolls 21, 22, 23, 24, 25, 26, and 27 are shown in Fig. 1, but the calendering conditions can be changed if there are three or more rolls. The multiple calender rolls are arranged in the frame 1 so that the directions of their rotation axes are parallel to each other.

[0009] The plurality of calender rolls are usually arranged such that metal rolls and elastic rolls are alternately arranged. At least one of the plurality of calender rolls may be connected to a drive shaft that rotates by power.

[0010] The plurality of calender rolls come into contact with each other due to their own weight, and nip pressure is generated at the contact points. The calender may have a pressure device for increasing the nip pressure to a level greater than the weight of the calender rolls.

[0011] In the example of Fig. 1, the roll lifting jigs 31, 33, and 35 of the calendar device are provided under the bearings of the first roll, the third roll, and the fifth roll from the top, but the locations and number of the lifting jigs can be adjusted as appropriate. The roll lifting jigs are also installed on the bearings at both ends of the rolls in the same arrangement as in Fig. 1 on the side opposite to the side shown in Fig. 1.

[0012] The paper passage path illustrated in FIG. 1 starts from the top of roll 21 and goes from the outer periphery of roll 21 → the nip portion between rolls 21 and 22 → the outer periphery of roll 22 → the nip portion between rolls 22 and 23 → the outer periphery of roll 23 → the nip portion between rolls 23 and 24 → the outer periphery of roll 24 → the nip portion between rolls 24 and 25 → the outer periphery of roll 25 → the nip portion between rolls 25 and 26 → the outer periphery of roll 26 → the nip portion between rolls 26 and 27 → the winder.

[0013] When the rolls are lifted by roll lifting jig 31 in the above paper passing state, roll 21 is lifted, the pressure in the nip between roll 21 and roll 22 is released, and the number of nip portions is reduced from six to five.

[0014] When the rolls are lifted by roll lifting jigs 31 and 33 in the above paper-feeding state, the pressure in the nip between rolls 21 and 22 and the pressure in the nip between rolls 23 and 24 are released, and the number of nip portions is reduced from six to four.

[0015] In the above paper feeding state, when the rolls are lifted by roll lifting jigs 31, 33, and 35, the pressure in the nip area between rolls 21 and 22, the pressure in the nip area between rolls 23 and 24, and the pressure in the nip area between rolls 25 and 26 are released, and the number of nip areas is reduced from 6 to 3.

[0016] In the calender device, an embodiment using two or more different types of elastic rolls is preferable because the surface properties of the paper can be changed even with the same number of nips by changing the roll lifting jig used for lifting the rolls.

[0017] In FIG. 1, a paper path along the outer periphery of the calendar roll is illustrated, but a guide roll may be provided to separate the paper path from the outer periphery of the roll after passing through the nip portion, and the paper may be made to pass through the guide roll so that the paper leaves the calendar roll after passing through the nip portion.

[0018] Fig. 2 is a cross-sectional view and a side view of the end of the calender roll of the calender device of the present invention. Fig. 3 is a side view of the lifting jig of the calender device of the present invention. The calender roll has a shaft portion protruding from the vicinity of the rotation axis of both ends of the calender roll, and has a bearing portion for holding the shaft portion in the frame. The bearing portion serves to reduce friction caused by the rotation of the calendar roll, and may be provided with a mechanism for preventing the position of the calendar roll from shifting in the axial direction on the frame.

[0019] The bearing portion preferably further has a bearing mechanism 4 and a housing portion 5 for accommodating the bearing mechanism, and has a cover portion extending from the housing portion 5 with a reduced diameter toward the end portion of the shaft portion beyond the bearing mechanism. It is preferable that the housing part and the cover part are connectable to a roll lifting jig 3 described later.

[0020] 3 in Figure 2 shows a cross section and a side view of the center of the lifting jig 31 in Figure 1. In these figures, the center of the side of the lifting jig has a semicircular recess which is a joint with the shaft bearing of the calendar roll. The housing portion 5 of the shaft bearing portion of the calendar roll is joined to the joint portion 3a of the lifting jig, and the cover portion 6 is joined to the joint portion 3b of the lifting jig.

[0021] Since the roll lifting jig is in contact with both the housing part and the cover part, when the calender roll is lifted by the roll lifting jig, the roll can be lifted while the bearing mechanism is kept perpendicular to the rotation axis of the roll, so that the calender roll can be lifted and the nip opened even while the calender roll is rotating. That is, the calendering conditions can be changed without stopping the calendering device, thereby improving productivity.

[0022] The calender device of the present invention preferably has a function of opening all the nip portions of the calender rolls at once. [Brief description of the drawings]

[0023] [Figure 1] 1 is a side view showing a schematic structure of a calendar device according to the present invention; [Diagram 2] 3A and 3B are a cross-sectional view and a side view showing the end structure of the calender roll of the calender device according to the present invention and a joint portion of a lifting jig that is joined to a bearing portion of the calender roll. [Diagram 3]FIG. 2 is a side view of the lifting jig of the calendar device according to the present invention. [Explanation of symbols]

[0024] 1: Frame 2, 21~27: Calendar roll 3, 31, 33, 35: Lifting jig 4: Bearing mechanism 5: Housing section 6: Cover part 7: Lifting device [Industrial Applicability]

[0025] According to the present invention, a calender apparatus excellent in productivity and safety is provided.

Claims

1. A calendar device in which a plurality of rolls are arranged vertically and a nip portion can be formed between adjacent rolls, the calendar device having a frame that rotatably holds the plurality of rolls, the plurality of rolls having shaft portions protruding from near the rotation axis at both ends of each roll, the calendar device having bearing portions for holding the shaft portions in the frame and a roll lifting jig in contact with the bearing portions, the roll lifting jig being connected to a lifting means whose position can be adjusted vertically.

2. 2. The calendar device according to claim 1, wherein the bearing portion has a bearing mechanism and a housing portion for accommodating the bearing mechanism, the housing portion has a cover portion which is reduced in diameter and extends toward the end portion of the shaft portion relative to the bearing mechanism, and the roll lifting jig contacts both the housing portion and the cover portion.

3. 3. The calendar device according to claim 1, wherein the roll lifting jig extends in a direction perpendicular to the rotation axis of the roll and in a horizontal direction, and the position of the roll lifting jig is adjusted by applying force to an end of the roll lifting jig in the extension direction.

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